The default parameters can be found in the Atlas manual in appendix B, the appendix on material systems. Hopefully this will correspond to how you intend to use the materials.

If not you'll need to generate your own additional parameters. You can ask the software vendor if they have more of the parameters. However given the materials system your asking about, it is unlikely. The vendors generally get their parameters either from the literature, or from customers. Unfortunately most customers are not willing to share data, so they tend to be on their own.

To generate your own you'll need to start by looking at the theory section of the software manual to determine the parameters you will need for the simulation you want to do. The list of parameters will definitely depend on what you intend to simulate, and you don't want to waste time generating parameters you don't need.

Then you can do a literature search looking for those parameters. Hopefully you will find some of them. For the other parameters you will need to determine how they can be extracted from data. To get that data you again can go to the literature and hope you find something usable. Or, you will need to go run some experiments to generate the data to allow you to extract the parameters.

You may also be able to estimate some of the parameters based on similar materials, but there are risks with this approach. Or you may be able to calculate some of the parameters from either an MD simulation or an a priori simulation.

Thank you sir!

I am trying to get these parameters from previously reported literature. But many of the parameters are not quoted in the related literature. Probably the authors were not interested to share the complete set material parameters what they have used during the simulation.

Thanks

Materials parameters are not often published as a full set in the literature, companies tend to be reluctant to publish these. If a company has material parameters that they have generated, then they likely consider that to be a competitive advantage.

If there is a publication that seems to have used a set of parameters that would be useful to you, try writing to the lead author, they might be willing to share some or all of their parameters. Your at a university, and may be considered a non-competitor or less of a competitor. There should at least be common interest in the research topic, and maybe even a collaboration. No cost to you if they don't. share.